Upside down A term used to indicate when something is not in the expected orientation. A car is upside down if it has turned over with the top against the ground.
Urea-formaldehyde foam A foam often used for insulation in walls and or attics. The material is very soft and fragile so it must be protected when in use.
Urethane A plastic material that is often foamed to a shape and allowed to harden. It can be used in a film or sheet for paint
Usage The act of using something such as electrical power. One refers to electrical energy consumption as power usage over a period of time.
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